Stop-motion for looms.



LTO'OOL'Ozl. PATLNTBD JULY 2s, 1908.

` T. MITOH-BLL O O. A. KNUOSEN.

STOP MOTION TOR LOOMs.

Y APPLICATION FILED IEB. 1l 1907. 3 SHEETS-SHEET 1. A

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Y E N w T T A STOP-MOTION FOR LOOMS.

i No. 894,521.

Specicaton bf Letters Patent.

Patented J' uly 28, 1908.

Application med February 1, 1907. seriailNo. 355,310.

To all whom it may concern:

Beit known that we, FLETCHER MITCHELL and CONRAD A. KNUDsEN, citizens of the United States, residing at Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented a certain new and useful Improvement in Stop-Motions for Looms, of which the following is a specification.

Our invention relates to a new and useful improvement in stop motions for looms, and has for its object to provide an effective mechanism by which a loom may be stopped at any predetermined point so as to enable the operator to change the color of the filling by changing the bobbins in the shuttles.

With these ends in view, this invention consists in the details of construction and combination of elements hereinafter set ferth and then ,speciiicallydesignated by the c alms.

In order that those skilled in the art to which this invention appertains may understand how to make and use the same, we will describe its construction in detail., referring by letter to the accompanying drawing forming a part of this specnication, in which- Figure 1 is a front elevation of our new stop motion mechanism; Fig. 2, a perspective thereof, a portion being broken away to more clearly illustrate the operating parts; Fig. 3, a detail perspective of a portion of the plunger rods showing their relation to the bracket upon which is carried the locking pawl; and

Fig. 4, an enlarged vperspective of a portion of one of the plunger rods clearly illustrating the action of the trip pawl on the cam shaft.v

' times through these fingers we provide apattern belt F, the upper portion of which may be run over any suitable idle pulley, while the lower p'rtion thereof runs over one end of the sand rolls of the loom, andthe Alatter when the loom is in operation will give this pattern belt a given speed, and upon the belt at predetermined intervals are secured the cross strips G which as the belt-travels will come in contact with the lingers E, thereby revolving the cam shaft through a part of a revolution.

The cam shaft D carries a camII which may be of any desired shape,here shown as square, and back of this cam is located a plunger rod I which is forced forward against said cam by the spring J, and this rod passes through the bracket K upon which is pivoted the locking pawl L. The pawl L is normally drawn inward by the spring M so that when the plunger rod is forced upward until the notch N formed thereon comes into alinement with the lockingpawl L the latter will spring beneath this notch and hold the rod in its elevated position. The rod always having a tendency to move downward by reason of the coil spring O attached thereto.

When the cam shaft is revolved, as before described, at a` predetermined time the revolvingof the cam will force the plunger rod backward and in so doing disengage the notch N from the locking pawl, permitting the plunger to be drawn downward by its spring. To this plunger is attached the draft strap P which passes over the pulley Q, and this strap is utilized for returning the plunger to its normal elevated' position by drawing thereon when said plunger will again be held by the locking pawl L springing beneath the vnotch N.

This plunger has a point T projecting therefrom which is adapted to come in contact with the upper end of the dog U, which latter is pivoted to the plunger rod I, so that when this last named rod is moved upward it will carry with it the lunger rod R. Thus when the strap P, is rawn upon both the lungers I and R they will be elevated and so ong as-the plunger I is held in this elevated position by locking awl L, Aboth of these plunger rods will be t us held in a normally elevated position.

V re resents the actuating cord which is secure at W, to the plunger rod R, and also passes over the pulley Q, and from thence to the shipper lever of the loom, and so long as the actuating plunger is elevated, the loom will continue to run, but when the cam H,

' forces the plunger rod I, out of engagement with the locking pawl, the plunger rods will be drawn downward by their spring, and by this movement the actuating cord V, will be pulled to shift the shipper lever and stop the oom. Now as this takes place when one of the cross bars G, comes in contact with the fingers E on the cam shaft, it will be seen that by setting these cross bars at the proper distances upon the pattern belt the loom will Vbe stopped at predetermined times, so that the operator may change the color of the filling by removing the bobbins from the shuttles and substituting others in their places.

When the cam trips the plunger I as before described, one of the points thereof will be in a position to force and hold the plunger rod backward and it is therefore necessaryA that the cam be turned sufficiently to carry this point out of engagement with the plunger rod, when said vrod is again elevated or otherwise the notch N could not come in engagement with the locking pawl, and to accomplish this turning of the cam a pawl e is pivoted to the up er portion of the plunger, and by means o spring b is held in alinement with the points d so as to engage therewith and turn the cam out of alinement with the plunger. In order that the cam may be held in this last named position against accidental rotation a stop cam e is carried by the cam shaft, and a shoe f is adapted to bear against this last named cam is carried by the upper end of the rod g which latter is forced upward by the spring h. Thus when the cam H has been turned out of operative position it will be held against further rotation by the shoe f but as this shoe is maintained in engagement with the cam e by spring pressure only, the further o eration of the cam shaft of the pattern be t will not be interfered with.

From this description it will be seen that the loom equipped with our improvement will be automatically stopped at a redetermined time and thus the color of ling will be maintained with accuracy, and without care on the part of the operator. This is a very im ortant feature in weaving various kinds o' fabric, since the stopping of the loom at the proper time has been dependent upon the udgment of the operator, with the result that widths or the colors and the lengths of the fabric is varied, and often considerable loss of both time and material is required to ravel out the filling to bring the goods to the proper length.

Having thus fully described our invention what we claim as useful is- 1. In the stop motion for looms the combination of a frame, two plungers fitted to slide in said frame, springs for drawing said plungers downward, means for holding said hsaid plungers in an elevated position, a cam shaft, a cam carried by said s raft adapted to trip the plungers and a cord connectmg one of the plungers with the stop lever of the loom, means for elevating the plungers, means for preventing the cam shaft from accidental rotation, a pattern belt carrying cross bars thereon at predetermined intervals foi` actuating the cam shaft at predetermined times as specified.

3. The herein described combination of a frame and plunger fitted to slide in said frame a spring for drawing said plunger' downward, a locking pawl adapted to engage a notch formed in said plunger for holding the latter in elevated position, a second plunger arranged parallel with the first named plunger and a spring for drawing said second plunger downward, means for causing the second named )lunger to move upward with the lfirst name plunger, a cam shaft and a cam carried by said shaft adapted to trip the first named plunger, means carried by the first named plunger for rotating the cam out of operative position, a second cam carried u on said cam shaft, a spring actuated shoe aldapted to bear against the second named cam to hold the first named cam out of operative position a series of fingers carried by the cam shaft a pattern belt adapted to be actuated by the sand roll of the loom, cross bars set at predetermined intervals upon the pattern belt adapted to engage said fingers to aetuate the cam shaft and means for connecting the second plunger with the stop lever of the loom as and for the purpose set forth.

4. In a mechanism for stopping a loom at a predetermined time, a suitable frame, a plunger I, a spring for actuating said plunger, a locking pawl adapted to engage a notch formed in the plunger whereby said plunger will be held in an elevated position, a cam shaft, a cam H carried by said shaft adapted to force the plunger out of engagement with the locking pawl, a pawl carried by said plunger, points carried by the cam shaft with which the last named pawl is adapted to cngage for turning the cam out of operative position when the plunger is elevated, a cam also carried by the cam shaft, a spring actuated pawl adapted to bear against the last named cam to hold the shaft against accidental rotation, a series of fingers projecting from the cam shaft, a pattern belt adapted to run upon one end of the sand roll of the loom, cross bars located at predctern'iined points` upon said belt and adapted to come in contact with the ngers Jfor actuating the cam In testimony whereof7 we have hereunto shaftI a plunger R arranged parallel with the aHlXed our signatures in the presence of two 10 p plunger IJ means for Connecting the two subscribing witnesses. plungers so that the plunger I will elevate the FLETCHER MITCHELL.

5 plunger R, a oord connecting the plunger CONRAD A. KNUDSEN.

with the sto lever of, the loom and a draft Witnesses: strap secure to the lunger I whereby the JOSEPH C. SMITH, latter may be elevatelfl, asspeefled. f S. M. GALLAGHER. 

